<!--
 * @Descripttion: 
 * @version: 
 * @Author: wtzhang
 * @Date: 2021-09-23 09:12:12
 * @LastEditors: wtzhang
 * @LastEditTime: 2021-09-23 09:17:17
-->
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <style>
    div {
      height: 100px;
    }
    #left {
      /* 定宽 */
      width: 400px; 
      float: left;
      background-color: antiquewhite;
    }
    #center {
      /* 定宽 */
      width: 400px; 
      float: left;
      background-color: aqua;
    }
    #right {
      /* 两列定宽 */ 
      /* margin-left: 800px;  */
      
      /* 开启BFC模式 */
      overflow: hidden;
      background-color: blueviolet;
    }
  </style>
  <div id="left"></div>
  <div id="center"></div>
  <div id="right"></div>
</body>
</html>